US10934031B2ActiveUtilityA1
Method for filling particulate water absorbing agent and method for sampling filled particulate water absorbing agent
Est. expirySep 30, 2033(~7.2 yrs left)· nominal 20-yr term from priority
B65B 1/22B65B 1/06B01J 20/28016G01N 1/04B01J 20/267B01J 20/28011B01J 2220/68
69
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0
Cited by
44
References
19
Claims
Abstract
A method for filling a particulate water absorbing agent includes a filling step of filling a particulate water absorbing agent into a filling container and a vibrating step of vibrating the filling container at the outside of the filling container, the vibrating step being conducted at least one time between the start and the end of the filling step, in which a vibration condition in the vibrating step satisfies the following conditions (a) and (b):(a) vibration by a vibrating body in contact with the filling container has a vertical directional component and a vibrational angle is within 90°±30°; and (b) total amplitude at no load and a vibration frequency at no load of the vibrating body are set so as to satisfy Equation 1-1 and Equation 2 or Equation 1-2 and Equation 2.
Claims
exact text as granted — not AI-modifiedThe invention claimed is:
1. A method for filling a particulate water absorbing agent, the method comprising:
a filling step of filling a particulate water absorbing agent into a filling container; and
a vibrating step of vibrating the filling container at the outside of the filling container, the vibrating step being conducted at least one time between the start and the end of the filling step, wherein
a vibration condition in the vibrating step satisfies the following conditions (a) and (b):
(a) vibration by a vibrating body in contact with the filling container has a vertical directional component and a vibrational angle is within 90°±10°; and
(b) total amplitude at no load and a vibration frequency at no load of the vibrating body are set such that the following Equation 1-1 and Equation 2 or Equation 1-2 and Equation 2 are satisfied;
[Mathematical Formula 1]
1≤acceleration (G)≤13 in a case in which final filling amount of particulate water absorbing agent per filling container: W 2≥100 kg (Equation 1-1)
1≤acceleration (G)≤15 in a case in which final filling amount of particulate water absorbing agent per filling container: W 2<100 kg (Equation 1-2)
[Mathematical Formula 2]
27.0≤vibration index≤44.0 (Equation 2)
Incidentally, the acceleration and the vibration index are values calculated by the following Equation 3 and Equation 4, respectively;
[
Mathematical
Formula
3
]
Acceleration
[
G
]
=
total
amplitude
at
no
load
[
mm
]
×
(
2
π
×
vibration
frequency
at
no
load
[
Hz
]
)
2
2
×
1000
×
9.8
(
Equation
3
)
[
Mathematical
Formula
4
]
Vibration
index
=
42
-
0.29
×
vibration
frequency
at
no
load
[
Hz
]
+
1.24
×
acceleration
[
G
]
.
(
Equation
4
)
2. The filling method according to claim 1 , wherein the acceleration is 10 G or less.
3. The filling method according to claim 1 , wherein the vibrating step is carried out when W1/W2=10% by weight to 100% by weight where a ratio of a filling amount W1 of the particulate water absorbing agent to a final filling amount W2 of the particulate water absorbing agent is expressed as W1/W2.
4. The filling method according to claim 1 , wherein a vibration frequency at no load of the vibrating body is from 10 Hz to 90 Hz.
5. The filling method according to claim 1 , wherein a relative humidity in a space portion within 30 cm from a particulate water absorbing agent surface is from 30% RH to 65% RH.
6. The filling method according to claim 1 , wherein the pallet is a replaceable plate-like body having a mass of from 5 kg to 50 kg per 1 t of the particulate water absorbing agent.
7. The filling method according to claim 1 , wherein the W2 is 20000 kg or less in Equation 1-1 above.
8. The filling method according to claim 1 , wherein a temperature of the particulate water absorbing agent in the vibrating step is from 30° C. to 70° C.
9. The filling method according to claim 1 , wherein the particulate water absorbing agent is constituted by containing a water absorbent resin, the water absorbent resin having an irregular crushed shape.
10. The filling method according to claim 1 , wherein a bulk specific gravity of the particulate water absorbing agent is from 0.50 (g/ml) to 0.70 (g/ml).
11. The filling method according to claim 1 , wherein the particulate water absorbing agent is obtained by a production method including a step of belt polymerization.
12. The filling method according to claim 1 , wherein a vibrational direction is adjusted by disposing a plurality of unbalanced mass-type vibration generators used for generation of vibration so as to cancel amplitude in a horizontal direction.
13. The filling method according to claim 1 , wherein said final filling amount is 100 kg or more and 20,000 kg or less.
14. A filled particulate water absorbing agent filled by the filling method according to claim 1 .
15. An absorbent article comprising a particulate water absorbing agent subdivided at from 1 g to 100 g from the filled particulate water absorbing agent according to claim 14 .
16. A method for manufacturing an absorbent article, the method comprising a step of preparing the filled particulate water absorbing agent according to claim 14 .
17. The method of claim 1 , wherein the particulate water absorbing agent has a crosslinked surface.
18. The filling method according to the claim 1 , wherein a resulting filled particulate water absorbing agent has a relative standard deviation of respective water absorption physical property values of particulate water absorbing agents sampled from the same filled particulate water absorbing agent at three or more points satisfies at least one of the following (a) and (d):
(a) a relative standard deviation of a centrifuge retention capacity (CRC) is 2% and
(d) a relative standard deviation of a free swell rate (FSR) is 5% or less.
19. A storage method or a transport method of a filled particulate water absorbing agent, where the filled particulate water absorbing agent has a relative standard deviation of respective water absorption physical property values of particulate water absorbing agents sampled from the same filled particulate water absorbing agent at three or more points satisfies at least one of the following (a) to (d):
(a) a relative standard deviation of a centrifuge retention capacity (CRC) is 2% or less;
(b) a relative standard deviation of a saline flow conductivity (SFC) is 6% or less;
(c) the relative standard deviation of an absorbency against pressure (AAP) is 1% or less; and
(d) a relative standard deviation of a free swell rate (FSR) is 5% or less, and
wherein sampling is conducted by a method of sampling a filled particulate water absorbing agent that is filled in a filling container and has a filling volume of V (cm 3 ), wherein
when a sampling number n (times) of the same filled particulate water absorbing agent and a distance x (cm) among the respective sampling points adjacent to one another are set, the following conditions (1) and (2) are necessarily satisfied:
[Mathematical Formula 5]
n≥m (1)
with the proviso that, m is greater one of 3 and
[Mathematical Formula 6]
[ V/ 100000]
[Mathematical Formula 7]
x≥y (2)
with the proviso that,
[
Mathematical
Formula
8
]
y
=
V
3
⌈
m
3
⌉
+
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